Email API for Developers Built to Automate and Scale

Integrate transactional email, automate, customise & scale your email communication with an application programming interface (API). Connect your user with real-time emails to build a strong relationship.

Developer  email Service
Developer email
Trusted by engineering teams
99.97%API uptime SLA
<400msAvg delivery time
8 SDKsEvery major language
50M+Emails/day capacity

Platform capabilities

A Complete Email API Service for Developers

We focus on developer-first infrastructure. Explore what you're going to get at TrueSend.

REST API + SMTP Relay

Send emails through our REST API for advanced automation or use SMTP relay for quick integration with existing systems. Unlock email deliverability with tracking & real-time insights.

Dynamic Webhooks

Get dynamic notifications for opens, clicks, bounces, spam complaints and opt-out processing for reliable event tracking.

Template Engine

Design, develop & send action-based email templates with personalised content and multi purpose templates for automated campaigns.

Analytics API

Get real-time analytics through the API custom dashboard. This will help enhance results.

SPF / DKIM / DMARC

At TrueSend, easily secure and authenticate your domain to improve inbox delivery and sender trust.

Batch & Bulk Sending

Now send high-volume personalised emails through a single API call. Get smart delivery controls with TrueSend.

📡 Live API reference

Developer Email Automation Tools to Synchronise in Minutes

Developers can easily future-proof their systems using automated email workflows. They can embed apps and CRMs through APIs. Now, you can deliver real-time transactional emails, monitor data for user engagement, and build expandable, customised campaigns with optimum performance of email delivery.

  • Safely retry failed API calls. Please note that no duplicating emails should be sent with idempotency Request Keys.
  • Deal with the large volume of emails and contacts through pagination and filters.
  • Gain secure access to the email API with the help of OAuth 2.0 and API keys.
  • OpenAPI 3.1 Spec can be used for effective API integration with automated code and documentation generation.
  • Email testing is performed in Sandbox Mode.
Marketing team collaborating

Infrastructure status

Designed for Developers Who Expect Reliability

To ensure continuous operation, all emails go through additional delivery channels. See failover capabilities, real-time monitoring, and email status tracking.

delivery.log · live stream Live
09:41:02[OK]msg_01hx → user@stripe.com · 312ms
09:41:03[OK]msg_01hy → ops@linear.app · 289ms
09:41:05[EVT]webhook open → msg_01hx
09:41:07[OK]msg_01hz → dev@vercel.com · 301ms
09:41:09[WRN]soft bounce → test@example.org retry #1
09:41:10[OK]msg_01ia → hello@supabase.io · 276ms
09:41:11[EVT]webhook click → msg_01hy
09:41:13[OK]msg_01ib → api@railway.app · 294ms
99.8%
Delivery success rate
↑ last 30 days
310ms
Average first delivery
↑ faster than last month
100%
Webhook delivery rate
↑ zero dropped events
0ms
Current incident time
All systems operational

Onboarding flow

Live in under 10 minutes

From zero to sending production emailhere's what the setup journey looks like.

1

Create your account & grab your API key

To create an account, sign up, verify email, and find your live API key in the dashboard. Start without a credit card.

2

Verify your sending domain

Add DNS records like SPF, DKIM, and DMARC. Our DNS wizard validates each one and flags any issues instantly.

3

Install the SDK & send a test email

Install the SDK via npm, pip, or Composer. Send your first email in just a few lines of code. Track delivery logs in real time.

4

Set up webhooks

Register your endpoint URL and start receiving open, click, bounce, and unsubscribe events within minutes.

5

Go live with confidence

Switch from sandbox to live mode, and set a warm-up schedule if needed. Monitor everything from the developer dashboard.

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Explore Ecommerce

Email Marketing for Developers That Enables Smooth API Integrations

Most people are customers of a product created by developers. Even the world's most innovative software relies on an email marketing channel to interact with users, announce releases, drive usage, and establish customer loyalty. That is the space that email marketing for developers occupies. Businesses will be able to seamlessly automate messages, create rich customer interactions, and send them at the right moment to the right customers.

The role of email in digital marketing is undeniable, and it continues to be one of the robust, scalable, and highly effective ways to communicate with users, regardless of whether you’ve built an application on mobile, SaaS, enterprise, or developer software.

A relevant email strategy always contributes to enhanced customer engagement. Moreover, it drives business growth through automated campaigns that help users sign up for retention campaigns, product updates, transactional messages, and onboarding email sequences.

At TrueSend, we’re an email marketing provider that helps technology businesses create results-focused email marketing campaigns that are sent to subscribers' inboxes. They are designed to encourage impactful customer interactions.

What Is Email Marketing for Developers?

Email Marketing for Developers is the process of capitalising on emails and an automated platform to engage with your users, customers, beta testers, and subscribers across the entire product lifecycle. However, it is not similar to marketing email. That’s because it relies extensively on automation, API integrations, user data, and behaviour to deliver bespoke messages and transform the customer experience.
An email API for developers is used to easily enable email capabilities in your software application. Rather than needing to hand-send individual emails or worry about managing an external service, this service allows for immediate and automatic sending of emails to users the moment they sign up to your application, verify their account or reset their password, perform an action such as upgrading their plan or completing a critical step in your application, etc.

Examples of commonly utilized cases for a developer email API:

  • Welcome email sequence
  • Account verification messages
  • Password reset email
  • Onboarding email sequence
  • Product update emails
  • API update notifications
  • Security notifications
  • Billing notifications
  • Subscription renewal reminders
  • Customer feedback requests

A developer email API of quality is an exquisite combination of deliverability and API connectivity, with flexible infrastructure and smart automation, as well as sophisticated and detailed analytics that offer clear communication.

Types of Emails Developers Should Send

The secret to effective email marketing is in delivering the right message at the right time. Developers must develop a results-driven email strategy that serves users well throughout their journey.

New User Welcome Emails

The welcome email immediately after signing up is the best first impression. Pump it with everything included for a hassle-free experience. It includes activation thanks to sign-up, a clear tour of the product, step-by-step tutorials, and so on. That welcome sequence will be very powerful and very efficient.

Onboarding Email Series

Try building a sequence that gradually unveils features, instead of shoehorning everything into one email. Each installment can include features, tips, an advanced feature, integrations, success stories, and confcall the customer while they… shine.

Product Update Emails

Your customers are always interested to know what is coming up. Make sure you communicate new features, improvements in performance, bug fixes, improvements to interfaces, and API improvements. Keep messaging concise and customer-focused.

Transactional Emails

Users actually enjoy receiving transactional e-mails because they are some of the most opened messages. Think offers such as the safe login e-mail, password reset e-mail, receipt of payment e-mail, receipts of purchased goods e-mail, and the renewal reminder e-mail. A trustworthy e-mail API for programmers will send these types of mail out straight away.

Educational Newsletters

Educational offerings. Educational materials are smart because they build trust, as well as deepen the customer’s value from the product. These can include how-tos, industry news, technical guides, empirical strategies, engineering blogs, API implementation guides, etc. Constant education only strengthens customer touchpoints.

Re-engagement Emails

Dormant users often require a re-activation nudge. Re-engagement campaigns are usually speckled with feature updates, personalised suggestions, special deals, stories of other people who use the product, improvements to the product & valuable resources.

Feedback and Survey Emails

Your users are the best source of information about your product. Interview customers about their experience with the product, features they want, bugs, ease of use, and upcoming features.

Some Significant Advantages of Email Marketing for Developers

Wondering if email marketing is only about sending out newsletters? It is an extension of your product designed for rapid, meaningful user communication.

Improve Product Adoption

Several users struggle to explore diverse products' offerings. System-generated onboarding emails educate users about the new features. In addition to helping them discover product value, they also reduce abandonment considerably. Developers can deliver meaningful content based on diverse factors like user behaviour.

Enhance Customer Retention

Keeping your existing customers will cost you significantly less than acquiring new ones. Consistent communication enables you to take your business to the next level. That’s because it keeps users not only informed about your product but also keeps them engaged throughout the customer journey.

One of the best things about email campaigns is that they can showcase exciting product features and deliver actionable insights. In addition, they highlight hidden capabilities and recognise customer achievements. Furthermore, they encourage users to engage again. These small points strengthen long-term customer relationships.

Automate User Communication

As your business reaches heights of success, you find it hard to cope with manual communication. Businesses can leverage developer email automation tools to seamlessly deliver emails triggered by specific user actions. These include dormant users, new user sign-ups, free trial expiry alerts, rejected payments, etc. You can ensure every user receives on-time communication without overburdening your workforce.

Deliver Customised Experiences

Email, unlike several traditional marketing channels, provides key takeaways into campaign effectiveness. Major performance metrics comprise various components such as email delivery rates, email open rates, email click rates, customer conversion rates, and more.

Email is undeniably one of the most trusted and flexible channels for user engagement. Not only does it improve product adoption, but it also helps build long-lasting customer relationships.

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